class_docstr: Test class for ablation tests.
class_docstr_tok: ["Test","class","for","ablation","tests","."]
docstr: Create necessary directories for testing.
docstr_tok: ["Create","necessary","directories","for","testing","."]
code: def setUpClass(cls):
      """Create necessary directories for testing."""
      for dir_path in [train_dir, test_dir, output_dir]:
          dir_path.mkdir(exist_ok=True)
  
      # create jsonlines feature files
      create_jsonlines_feature_files(train_dir)
  
file_path: skll/tests/test_ablation.py
imports: import csv
  import json
  import unittest
  from skll.experiments import run_configuration
  from skll.utils.testing import config_dir, create_jsonlines_feature_files, fill_in_config_paths, output_dir, remove_jsonlines_feature_files, test_dir, train_dir, unlink
label_desc: Use image node_id 1 for calling the TestAblation obj's underlying member method code with example usage: obj.setUpClass(cls) without return types